Getting a handle on the origin of the Galactic Bulge

Details Getting a handle on the origin of the Galactic Bulge Getting a handle on the origin of the Galactic Bulge

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..268l&link_type=abstract

NOAO Proposal ID #2006A-0268

Physics

Scientific paper

The origin, chemical properties, and evolution history of the Galactic Bulge remain poorly understood. Abundance ratios of bulge stars, especially in the [(alpha)/Fe] vs [Fe/H] diagram, serve to constrain the evolutionary models. Measuring, for instance, a high (alpha) over-abundance indicates rapid and early star-formation. Thus, we propose an infrared based study of the (alpha) elements, including oxygen, of ten stars in two low-extinction windows towards the bulge. We will also re-investigate the oxygen abundance trends found from optical spectra of K giants in Baade's window by McWilliam & Rich (2004), which indicate a surprising cession of oxygen production in the bulge for metallicities larger than -0.5. The infrared, with lower extinction and molecular rather than atomic abundance indicators, is a preferred wavelength region to study abundances in bulge stars.

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